What physiological event corresponds with systolic pressure?

Systolic pressure refers to the pressure in the arteries when the heart muscles contract and pump blood out into the circulatory system. During this phase of the cardiac cycle, the ventricles of the heart contract, forcing blood into the aorta and pulmonary arteries. This contraction creates a peak pressure that is measured as systolic pressure, which is the higher number in a blood pressure reading.

Understanding this physiological event is key for recognizing how the heart functions and how blood pressure is regulated. The other options relate to different aspects of the cardiac cycle but do not accurately describe the condition associated with systolic pressure. For instance, heart relaxation occurs during diastole, while blood flow stabilization and blood pressure equalization do not specifically correlate with the active contraction of the heart that defines systolic pressure.